After comparatively researching the typical soil profile series situated in dry and hot valley region of Jinsha river in Yunnan province under the condition of different ecological landscape, the phase of soil degradation process and its characteristics about dry red soil and vertisol series were initially determined. The indexes of thickness in soil humus horizon (A), content of organic matter, soil structure, content of total nitrogen in soil, or including soil fissure, clay activity and so on could be used in showing the phase characteristics of soil degradation process. Furthermore, the soil degradation model with change type in step by step, jump and combination in soil degradation process was put forward.